<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>登录</title>
</head>
<body>
<a href="resp-encoding">下载图片 car1.png</a>
<form action="login" method="post">
    <input type="text" name="username" placeholder="用户名" required><br>
    <input type="password" name="password" placeholder="密码" required minlength="6"><br>
    <input type="text" name="captcha" id="">
    <img src="captcha" />
    <input type="submit" value="登录" />
</form>

</body>
</html>